Evenings and Weekends Package

[#1]

Hi - can someone tell me the definition of evenings in terms of times?
I made two calls to the same number on the same evening. One was between 6pm and 7pm and I was charged. The other was after 7pm and I was not charged?

[#2]

https://www.plus.net/home-broadband/faqs/broadband-and-phone/#included-calls

Quote

Between 7pm and 7am weekdays and all weekend with Evening & Weekends